OR you can just do basic research on such reputable review sites such as TomsHardware, Guru3D, and several others to see how a card will perform in games. 3DMark, Passmark, PCMark, all are synthetic garbage which means jack.

Which is why AMD and nVidia release "demos" to demonstrate what a card can do, but a card could perform better than any other in a synthetic benchmark, but if a game developer releases a game coded like ***** or quickly ported from a console (which happens...most of the time actually) it doesn't matter how much power a card has, it's going to perform like *****.